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Finding the Fourth Proportional to 1,185.26, 1,777.75 and 319.64

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Solution

The fourth proportional to 1,185.26, 1,777.75 and 319.64 is: 479.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.26 : 1,777.75 = 319.64 : x
  2. Step 2: Convert to fraction form
    1,185.26/1,777.75 = 319.64/x
  3. Step 3: Cross multiply
    1,185.26x = 1,777.75 × 319.64
  4. Step 4: Simplify right side
    1,185.26x = 568,230.32
  5. Step 5: Solve for x
    x = 568,230.32/1,185.26
  6. Step 6: Final answer
    x = 479.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.